The esophagus has to be flexible to allow for food to travel from the mouth to the stomach
        
             
        
        
        
Hummingbird predators would not have a food source, therefore competitive exclusion would occur and there'd be a decrease in hummingbird predators. There would also be an increase in the number of the hummingbird's prey since the hummingbird wouldn't be there to consume them. The absence of the species would mess up the rest of the ecosystem
        
                    
             
        
        
        
The answer is A - Sac Fungi
        
             
        
        
        
It is c. White blood cells